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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 83,070 | $ 84,021
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 172 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (7,480) | (7,641)
Held-to-Maturity Market Value | 75,762 | 76,485
Total | 3,763,658 | 3,827,418
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 2,279 | 834
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (380,988) | (418,604)
Investment securities available-for-sale | 3,384,949 | 3,409,648
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 37,319 | 37,312
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,898) | (4,616)
Investment securities available-for-sale | 33,421 | 32,696
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 80,728 | 80,382
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (12,963) | (13,914)
Investment securities available-for-sale | 67,765 | 66,468
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 734,761 | 747,478
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 624 | 47
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (86,142) | (97,462)
Investment securities available-for-sale | 649,243 | 650,063
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 34,659 | 35,363
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3,981) | (4,114)
Held-to-Maturity Market Value | 30,678 | 31,249
Total | 669,015 | 676,934
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 2
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (44,121) | (47,374)
Investment securities available-for-sale | 624,894 | 629,562
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 9,030 | 9,280
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (684) | (827)
Held-to-Maturity Market Value | 8,346 | 8,453
Total | 524,394 | 538,970
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 121 | 181
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (59,400) | (61,439)
Investment securities available-for-sale | 465,115 | 477,712
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 8,131 | 8,128
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 172 | 105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (186) | (201)
Held-to-Maturity Market Value | 8,117 | 8,032
Total | 828,948 | 832,066
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,355 | 565
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (111,128) | (124,168)
Investment securities available-for-sale | 719,175 | 708,463
Asset-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 746,463 | 772,261
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 179 | 39
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (51,567) | (60,975)
Investment securities available-for-sale | 695,075 | 711,325
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 31,250 | 31,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (2,629) | (2,499)
Held-to-Maturity Market Value | 28,621 | 28,751
Total | 142,030 | 142,015
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 0 | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (11,769) | (8,656)
Investment securities available-for-sale | $ 130,261 | $ 133,359

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